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To study the effects of the 1900 MHz electromagentic field emitted from cellular phone on nocturnal melatonin secretion.
Salivary melatonin was collected at 19:00 h and 2:00 h; for 30 min every hour from 19:00 h and 1:00 h the subjects used a cellular telephone continuously.
|ばく露時間||intermittent for 30 min/h for 6 h|
|Distance between exposed object and exposure source||0 cm|
|ばく露装置の詳細||Subjects stayed in a climatic chamber with the receiver directly attached to the left ear.|
|Additional information||On one day the receiver emitted an EMF, while on sham day there was no emission. The subjects did not know the exposure condition.|
The study showed significant reduction of salivary melatonin at 2:00 h.